Advice for prep my planter

Morning. This gorgeous planter is a gift for my birthday.
I have lined with pond liner and made some drainage slashes. I will put some horticultural grit in before filling with compost before planting. Do I need to do anything else?

Looks super. What ideas do you have for planting it up?

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I’ve got Dwarf Dahila, Cosmo, Achillea and some trailing plants.


Looks fab. The different levels make it look so unique and interesting. Please show us when the dahlias are flowering.